Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5.
Environ Pollut. 2013 Mar;174:229-35. doi: 10.1016/j.envpol.2012.12.001. Epub 2012 Dec 31.
We have developed a local mass balance model for the St. Lawrence River near Cornwall, Ontario that describes the fate and transport of mercury in three forms, elemental, divalent, and methylated, in a five compartment environment (air, water, sediments, periphyton, and benthos). Our objective was to construct a steady-state mass balance model to determine the dominant sources and sinks of mercury in this environment. We compiled mercury concentrations, fluxes, and transformation rates from previous studies completed in this section of the river to develop the model. The inflow of mercury was the major source to this system, accounting for 0.42 mol month(-1), or 95.5% of all mercury inputs, whereas outflow was 0.28 mol month(-1), or 63.6% of all losses, and sediment deposition was 0.12 mol month(-1), or 27.3% of all losses. Uncertainty estimates were greatest for advective fluxes in surface water, porewater, periphyton, and benthic invertebrates.
我们开发了一个安大略省康沃尔附近圣劳伦斯河的局地质量平衡模型，该模型描述了三种形态的汞（元素态、二价态和甲基化）在五个环境（空气、水、沉积物、周丛生物和底栖生物）中的归宿和输移。我们的目标是构建一个稳态质量平衡模型，以确定该环境中汞的主要来源和汇。我们从前在该河这一段进行的研究中收集了汞浓度、通量和转化速率的数据来建立模型。汞的流入是该系统的主要来源，占所有汞输入的 0.42 mol 月(-1)，或 95.5%，而流出为 0.28 mol 月(-1)，或 63.6%，沉积物沉积为 0.12 mol 月(-1)，或 27.3%。地表水、孔隙水、周丛生物和底栖无脊椎动物中表流的不确定性估计最大。
